Interestingly, and perhaps a clue, is that showing ALL unread messages only shows message up to 9:14 am PDT. None of the messages posted since then appear in that listing. I suspect this is related to timezone issues.

To chime-in, I too have had similar intermittent problems. I never did figure out what was causing it. However, since I run Google Chrome almost exclusively now for browsing, I just created a shortcut (http://www.wxforum.net/index.php?action=unread;all;start=0) on the Bookmarks Bar (and then enabled it so it shows at the top). That allows me to see anything I may have missed.

I've been having problems with this since we upgraded to the new forum (although I like the new forum look and layout). I think it is a bug related to the "ignore boards" option. To those of you who think you're still having problems with the "Show unread posts", do you have any boards checked under the "ignore boards" section of the "modify profile"? I have about 10 boards checked and I think that is causing the problem. ....and yes, I do understand that if I choose to ignore a board, it won't show up under "Show unread posts since last visit".

What I'm experiencing is that when I click the "Show unread posts since last visit" link, I might get 10 unread posts. But if I choose to show "All unread topics" I see new posts for Boards that are NOT checked on my ignore boards option, so I should be seeing those when I click on the "Show unread posts since last visit" link.